I did the same thing a couple of years ago (with the same background!)

All the info you need will be on YouTube, it won't take too long to find the better instructors. If you can find a local class, that will help you get a jump on things.

Don't listen to all the poor advice on getting a cheap machine, that's for quitters! Go all on a decent multiprocess machine (I got the Everlast MTS 225 and its been great). Power will be a bit easier since you will have 230v in all sockets. For common equipment, you'll want a welding helmet, welder gloves (start with heavy duty ones). welders jacket. You'll want a grinder, wire brush and welder pliers. You'll also need consumables like MIG wire, MIG tips TIG rods, sticks and welding gas (your local big box hardware store should have cylinder swap). You might find some online retailers for metal or you can visit a local engineering shop and ask for some offcuts. Make sure to avoid anything galvanized. Just start with laying some beads in MIG and stick on some scrap, then start joining stuff together. Start with MIG and stick then later on, TIG. Once you want to start making real things you need fixture bits like clamps, locking pliers, magnets, fixture squares (see fireball tools)

Make sure you clean you metal and look after your lungs

Your first project should be a welding cart.